What were three major achievements of Maya civilization and WHY were they major?

The Maya civilization achieved remarkable advancements in mathematics, astronomy, and architecture. Their development of a complex calendar system and the concept of zero in mathematics were significant as they allowed for sophisticated timekeeping and calculations, influencing various aspects of daily life and agriculture. In astronomy, the Maya made precise observations of celestial bodies, which enabled them to create calendars that guided agricultural practices and rituals. Architecturally, their impressive pyramids and cities, such as Tikal and Chichen Itza, demonstrated their engineering skills and social organization, serving as centers for trade, religion, and governance.